You can still do this. In Run Faster there are rules for making infected chars:.
RF p134
Newly created Infected PC characters are assumed to have been recently Infected, or at very least to share the qualities of the recently Infected. Fledgling Infected do not, in general, begin their new lives with the entire gamut of modified attributes that NPC Infected do. Each Infected quality lists both the Physical and Mental Attributes that can be improved by HMHVV. The newly Infected PC may increase two Physical attributes by one point each, or one Physical attribute by two points. Likewise, they may increase two Mental attributes by one point each, or one Mental Attribute by two points. The attributes they select must come from the Improved Physical Attributes and Improved Mental Attributes lists included with each quality. The character’s new minimum and maximum attributes are listed in the Infected Metatype Attribute Table (p. 135).